A critical requirement of the polariser module is that the illumination is uniform across the exit pupil. Unfortunately, a conventional Glan-Taylor arrangement cannot provide this uniformity due to the strong variation in transmission at a refractive surface for angles close to the critical angle. Therefore a modified prism arrangement is proposed and this is described in detail. Detailed tolerance modelling and straylight modelling is also reported here.
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Stephen Rolt, Ariadna Calcines, Bartosz Lomanowski, David Bramall, Benjamin Shaw, "An efficient stable optical polariser module for calibration of the S4UVN earth observation satellite," Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99126V (22 July 2016);